Role of aluminium in the silicate network: In situ, high-temperature study of glasses and melts on the join SiO2-NaAlO2

Details Role of aluminium in the silicate network: In situ, high-temperature study of glasses and melts on the join SiO2-NaAlO2 Role of aluminium in the silicate network: In situ, high-temperature study of glasses and melts on the join SiO2-NaAlO2

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.1727n&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 60, Issue 10, p. 1727-1737.

Physics

9

Scientific paper

The structure of glasses and melts in the NaAlSiO2-SiO2 system was determined in situ as a function of temperature by Raman spectroscopy, in the temperature range of 300 K 1800 K. The high-frequency envelope of the Raman spectra of Al-free SiO2 glass is deconvoluted in three different bands (1050, 1150, and 1200 cm-1) with the 1150 and 1200 cm-1 bands attributed to Si-O0 stretch vibrations in Q4 species in the fully polymerized network. There is a decrease in their frequencies with increasing Al/(Al + Si) of the glasses and melts in the Al/(A1 + Si) range investigated (0 0.5). The spectra are consistent with Al3+Si4+ substitution in two coexisting, three-dimensionally interconnected structural units. These units have different average intertetrahedral angles. Aluminum partitions preferentially into the unit with the smaller angle at low Al/(Al + Si) (less than ~0.3), and into the unit with the larger angle at higher concentrations. There is no evidence for major structural changes (i.e., redistribution of Al) in the glasses and melts as a function of increasing temperature.

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